Electrothermostatic cable for fire-alarms.



No. 664,966. Patented Jan. I, SUL

, A., MUNKEH. l

ELEC''RUTHEBHQSTATHC CABLE FDR FERE ALARMS (Application me@ pn 14, 1960.) (No Mudd.)

L Fly-f 6 e /zgwsses. fnvezzfor.

his ffrney UNITED VS'TrvrEs PATENT OFFICE.

ADOLPH MNKER, OF SOHOENEBERG, GERMANY.

ELECTR'OTHERMOSTATIC CABLE FOR FIRE-ALARMS.

SPECIFICATION forming part of Letters Patent No. 664,966, dated .l'anuaryr 1, 1901.

' Y Application tiled Aprill, 1900. Serial No. 12,856- (No model.) A

To will whom t may con/cern:

Be it known that I, ADOLPH` MNKER, lithographer, a subject of the Emperor of Germany, residing at 4:0 Grunewaldstrasse,

-Scheneberg, near Berlin, in the Kingdom oi Prussia, German Empire, have invented a new and useful Electrothermostatic Cable for Fire-Alarms, of which .the following is a full,- clear, and eXact-specilication.

My invention consists of a new-and useful electmthermostatic cable for fire-alarms; and its object is to provide a wire conductor of the cable form in which two conducting-wires insulated from each other and normally out of electrical contact areadapted to complete an electric circuit containing the lire-alarm apparatus bythe fusion of a melting piece inserted between two elastic contacts, which are secured to the conducting-wires by soldering or in any similar manner before insulating the wires from each other, so that the ends 0f said contacts after insulating and lwinding project out of lthe insulating-envelop. The

cablehas the thusfformed thermal circuit- @losers secured to it at any suitable distance -from each other, for the purpose required.

. This cable lthus provided with numerous circuit-closers of the described form will canse an alarm to be operated at every dangerous? in Figure l, a short length of the cable,'its

.forming partiathereof.

insulating-envelop being broken away at itsfends to show the t'wo conducting-wires.`

Fig. 2 is a cross-'sectional view of the cable, showing oneof the thermal circuit-closers e Fig. 3 shows aplan view of the cable, the insulating-covering and the circuitcloser being partly shown in section. Fig. 4 illustrates a diagram of the cable show-n.

Before insulating the two conducting-wires a and b the two elastic contacts c are respectively secured to the wires by soldering or in any similar manner, as shown in Fig. 2, sothat said .contacts c after insulating and Winding partially'pr-ojectl out of the insulating-envelop e. Between said elastic contacts c are clamped thin insulating-pieces o5, of a fusible material melting easily and without residuum at any dangerous increase of temperaturesuch as paraflin, stearin, and the like. This cable, connected at one endto the .circuit of a single realarm bell, will give a signal forevery increase of heat at all points of the cable provided with the thermal cir- -cuit-closers, because the circuit is instantly closed if one of the fusible pieces melts by an increase of beat.

What I claim as my invention isi An electrothermostatic cable for fire-alarms consisting of two conducting-Wires insulated from each othery and a suitable number of thermal circuit-closers forming part of the cable,` said 'circuit-closers consisting. of two sible piece, between said contacts, substanf tially as described. i

ln witness whereof I have hereunto signed presence of two subscribing witnesses.

ABOLPH MUNKER. Witnesses: i

HENRYv HASER, Yif?Ninna/.nin HAUPT.

to be connected to adire-alarm apparatus not my name', this 16th day of March, 1900, in the elastic contacts respectively securedto the conducting-Wires before insulating anda fu- 

